Comment 1 for bug 388908

This is a regression in 1.16, I think.

It's a messy one, though. When RemoteBzrDirFormat.initialize_on_transport_ex invokes require_stacking() it has no knowledge of the source format (despite the message it emits!), so it's difficult to fix.

My initial feeling is that initialize_on_transport_ex is the problem: it is half-way between a simple function and a comprehensive one. Specifically, it handles bzrdirs and repositories, but not branches. My suspicion is that the right fix will be to extend initialize_on_transport_ex (or make a new variant) that also initializes branches.